.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden; /* 确保背景不会滚动 */
  }
  
  .register-container {
    display: flex;
    justify-content: center;
    align-items: center;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
  }
  
  .register-form {
    background-color: #fff;
    padding: 40px; /* 放大表单 */
    border-radius: 10px; /* 放大表单的圆角 */
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1); /* 增加阴影 */
    width: 400px; /* 放大表单 */
    text-align: center;
    position: relative;
  }
  
  .logo {
    position: absolute;
    top: 10px;
    left: 10px;
    width: 50px;
    height: 50px;
  }
  
  form {
    display: flex;
    flex-direction: column;
  }
  
  .form-group {
    margin-bottom: 20px;
    text-align: left;
  }
  
  label {
    margin-bottom: 5px;
    display: block;
  }
  
  input {
    width: 100%;
    padding: 10px;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 5px;
  }
  
  .captcha-img {
    display: block;
    margin-top: 10px;
    cursor: pointer;
  }
  
  .register-submit {
    padding: 10px;
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }
  
  .register-submit:hover {
    background-color: #0056b3;
  }
  
  .login-link {
    position: absolute;
    bottom: 10px;
    right: 10px;
    color: #007BFF;
    text-decoration: none;
  }
  
  .login-link:hover {
    text-decoration: underline;
  }